/Engine/Source/Runtime/Landscape/Classes/LandscapeComponent.h
Add the used GUIDs from UMapBuildDataRegistry::MeshBuildData. Used to preserve hidden level data in lighting scenario.
virtual void AddMapBuildDataGUIDs ( [TSet](API\Runtime\Core\Containers\TSet)< [FGuid](API\Runtime\Core\Misc\FGuid) > & InGUIDs ) const